Dual-layer needle aseptic syringe

Abstract

The application discloses a double-layer needle aseptic syringe, which comprises a needle cylinder, a piston rod, an elastic resistance flow member, an injection needle and a protective needle.

Description

Technical Field

[0001] This invention relates to the field of syringe instrument technology, and more particularly to a sterile syringe with a double-layered needle. Background Technology

[0002] Preparing medication solutions is a common clinical procedure. When preparing medication solutions, medical staff usually use a syringe to slowly inject the solvent (such as normal saline, glucose injection, etc.) into the medication bottle, gently shake or agitate the medication bottle to fully dissolve the medication. After the medication is completely dissolved, the required dose of medication solution is drawn out using a syringe and injected into the infusion bag or given to the patient via intramuscular injection.

[0003] During the preparation of solutions, multiple different drugs need to be prepared, requiring repeated punctures of the rubber stoppers of different drug vials with a syringe. This causes wear and tear on the syringe needle, reducing its sharpness and exacerbating the pain experienced by patients during intramuscular injections. Furthermore, when preparing hormone or chemotherapy drugs, these drugs are irritating to the skin. Repeated punctures during preparation can cause the drug to adhere to the outer surface of the syringe needle. When administering intramuscular injections, this irritating drug inevitably comes into contact with the injection site, causing swelling or bruising at the injection site.

[0004] Therefore, there is an urgent need for a sterile syringe with a double-layered needle that can prevent the needle from becoming less sharp during medication preparation due to repeated punctures, thus reducing pain for patients during intramuscular injections; and prevent irritating drugs from contaminating the outer surface of the needle, thus avoiding irritation to the injection site. Summary of the Invention

[0005] To address the aforementioned issues, this application discloses a double-layered needle sterile syringe. The protective needle and the injection needle of this device form independent inlet and outlet channels. During the preparation of medication, it not only ensures that the medication is drawn into the syringe but also protects the injection needle from wear, thereby reducing pain to the patient during injection. Furthermore, the independent inlet and outlet channels also prevent irritating drugs from contaminating the outer surface of the injection needle, thus avoiding irritation to the injection site.

[0006] To achieve the above objectives, this application adopts the following technical solution, which includes: A syringe has an internal cavity for receiving medication, and one end of the syringe has an outlet connector and an inlet channel. The outlet connector contains a one-way valve. A piston rod extends axially into the cavity for receiving medication. An elastic flow-blocking element is disposed in the cavity for receiving medication and covers the inlet channel. An injection needle is connected to the outlet connector. A protective needle has an internal cavity and an inlet channel. The protective needle is fitted over the injection needle through the cavity and connected to the syringe. The inlet channel communicates with the inlet channel after being connected to the syringe. When the piston rod moves away from the protective needle, a negative pressure is generated in the cavity for receiving medication, causing the elastic flow-blocking element to deform and open, allowing external medication to flow into the cavity for receiving medication sequentially through the inlet channel and the inlet channel. When the piston rod moves towards the protective needle, the one-way valve opens, and the medication in the cavity for receiving medication is discharged from the injection needle through the outlet connector.

[0007] In one illustrative embodiment of a double-needle sterile syringe, the elastic flow-blocking element is a circular sheet structure, wherein an avoidance hole is provided at the center of the elastic flow-blocking element, the avoidance hole corresponds to the liquid outlet connector, and the edge of the avoidance hole is fixedly connected to the inner wall of the liquid receiving cavity.

[0008] In one illustrative embodiment of a double-needle sterile syringe, the injection needle is fixedly connected to the dispensing connector.

[0009] In one illustrative embodiment of a double-needle sterile syringe, the protective needle is detachably connected to the syringe barrel.

[0010] In one illustrative embodiment of a double-needle sterile syringe, a connecting portion is provided at one end of the protective needle along its length extension direction, wherein the connecting portion is threadedly connected to the syringe barrel.

[0011] In one illustrative embodiment of a double-needle sterile syringe, the inner wall of the receiving cavity is provided with several elastic seals, wherein several of the elastic seals are sealed to the outer surface of the injection needle.

[0012] In one illustrative embodiment of a double-needle sterile syringe, the inlet channel includes an inlet end and a connecting end, wherein an insertion protrusion is provided along the contour of the connecting end, and after the protective needle is connected to the syringe barrel, the insertion protrusion extends into the inlet channel.

[0013] In one illustrative embodiment of a double-needle sterile syringe, the syringe further includes a needle sheath, which is fitted over the protective needle.

[0014] The preferred embodiments will be described below in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of the double-needle sterile syringe. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram illustrating a possible embodiment of a sterile syringe with double-layered needles.

[0016] Figure 2 This is a schematic diagram illustrating the structure of a syringe.

[0017] Figure 3 Used to explain Figure 1 Schematic cross-sectional view along the AA direction.

[0018] Figure 4 Used to explain Figure 3 Enlarged view of point B.

[0019] Figure 5 This is a schematic diagram illustrating the structure of the elastic flow-blocking element when the liquid enters the liquid receiving cavity.

[0020] Figure 6 This is a schematic diagram illustrating the structure of a one-way valve when the liquid is discharged from the liquid container.

[0021] Figure 7 This diagram illustrates the connection between the protective needle and the injection needle.

[0022] Figure 8 Used to explain Figure 7 Enlarged structural diagram at point C.

[0023] Figure 9 A cross-sectional view used to illustrate the protective pin.

[0024] Figure 10 A schematic diagram illustrating the cross-section of the protective pin.

[0025] Figure 11 This is a schematic diagram illustrating the structure of the plug-in protrusion.

[0026] Label Explanation 1. Syringe; 11. Medication receiving cavity; 12. Dispensing connector; 121. One-way valve; 13. Inlet channel; 14. Elastic flow-blocking element; 2. Injection needle; 3. Protective needle; 31. Receiving cavity; 311. Elastic seal; 32. Inlet channel; 321. Inlet end; 322. Connecting end; 323. Insertion protrusion; 33. Connecting part; 4. Piston rod; 41. Push rod; 42. Piston part. Detailed Implementation

[0027] To provide a clearer understanding of the technical features, objectives, and effects of this application, specific embodiments of this application are now described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate components with the same or similar structures but the same function.

[0028] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0029] Figure 1 This is a schematic diagram illustrating a possible embodiment of a sterile syringe with double-layered needles. Figure 2 This is a schematic diagram illustrating the structure of a syringe. Figure 3 Used to explain Figure 1 A cross-sectional view along the AA direction. (Combined with...) Figure 1-3 The double-needle sterile syringe includes: a syringe barrel 1, a piston rod 4, an elastic flow-blocking element 14, an injection needle 2, and a protective needle 3; such as Figure 3 As shown, the syringe 1 has a drug-containing cavity 11 inside, and the drug-containing cavity 11 has an inlet at one end of the syringe 1; the piston rod 4 includes a push rod 41 and a piston part 42 provided at one end of the push rod 41, wherein the piston part 42 enters into the drug-containing cavity 11 through the inlet. In actual use, the doctor holds the push rod 41, which allows the piston part 42 to move axially within the drug-containing cavity 11.

[0030] like Figure 2 , 3 As shown, the end of the syringe 1 corresponding to the insertion port is a flat surface, which has a liquid outlet connector 12 and two liquid inlet channels 13 surrounding the liquid outlet connector 12. Both liquid inlet channels 13 are connected to the drug solution receiving cavity 11. The liquid outlet connector 12 and the syringe 1 can be fixedly connected or integrally connected. Figure 2 The liquid outlet connector 12 is equipped with a one-way valve 121, which only allows the liquid to be discharged from the liquid receiving chamber 11 to the outside.

[0031] Figure 4 Used to explain Figure 3 Enlarged view at point B. The elastic flow-blocking element 14 is located inside the liquid receiving cavity 11 and near the liquid outlet connector 12, as shown... Figure 4 As shown, the elastic flow barrier 14 covers the two liquid inlet channels 13. Specifically, the elastic flow barrier 14 has a circular sheet structure with a clearance hole at its center. The edge of the clearance hole is fixedly connected to the inner wall of the syringe 1, while the outer edge of the elastic flow barrier 14 is not connected to the inner wall of the syringe 1.

[0032] Figure 5 This is a schematic diagram illustrating the structure of the elastic flow-blocking element when the liquid enters the liquid receiving cavity. Figure 6 This is a schematic diagram illustrating the structure of a one-way valve when the liquid medicine is discharged from the liquid medicine receiving chamber. (Example:) Figure 5 , 6 As shown, the injection needle 2 includes a hollow first needle body and a first needle seat. The first needle seat is located at one end of the first needle body. The first needle body is connected to the liquid outlet connector 12 through the first needle seat. The first needle body and the first needle seat form a liquid discharge channel. As mentioned above, the elastic flow-blocking member 14 covers the two liquid inlet channels 13. Therefore, when the piston moves towards the liquid outlet connector 12, positive pressure is generated in the liquid receiving cavity 11. The one-way valve 121 opens under the action of positive pressure. At this time, the liquid is discharged from the injection needle 2.

[0033] Figure 7 This diagram illustrates the connection between the protective needle and the injection needle. Figure 8 Used to explain Figure 7 Enlarged structural diagram at point C. The protective needle 3 includes a second needle body and a second needle seat, as shown... Figure 8 As shown, a receiving cavity 31 is formed in the body of the second needle. The first needle body of the injection needle 2 extends into the receiving cavity 31 and is sealed and connected to the receiving cavity 31, so that the protective needle 3 and the injection needle 2 form a sleeve relationship. In this configuration, during the drug preparation process, the second needle body of the protective needle 3 will be punctured into the rubber stopper of the medicine bottle, so that the first needle body of the injection needle 2 does not come into contact with the rubber stopper, thereby avoiding wear on the first needle body.

[0034] like Figure 4-7As shown, the second needle hub also has a connecting part 33. The inner surface of the connecting part 33 is provided with an internal thread, and the outer surface of the syringe 1 is provided with an external thread. Through the cooperation of the internal and external threads, the protective needle 3 can be connected to the syringe 1. In actual use, when the solution needs to be injected into the patient after preparation, the connecting part 33 can be separated from the syringe 1 by rotating the second needle hub, and the protective needle 3 can be separated from the injection needle 2. At this time, the injection needle 2 is fully exposed, and the doctor can use the injection needle 2 to give the patient an intramuscular injection. Under the above setting, compared with the traditional use of the same syringe needle for both preparation and injection, the first needle body of the injection needle 2 of this application will not be worn during the preparation process. Therefore, the sharpness of the first needle body can be guaranteed, so that it can easily penetrate into the patient's skin tissue when the solution is injected. Thus, compared with the traditional injection operation after preparation, the pain caused to the patient can be reduced.

[0035] Simultaneously combined Figure 4-7 Two corresponding inlet channels 32 are formed between the inner and outer surfaces of the second needle body and between the inner and outer surfaces of the second needle seat. After the connecting part 33 is connected to the syringe 1, the inlet channels 32 are connected to the inlet channels 13 of the syringe 1, and combined with... Figure 4-6 During the medication preparation process, the second needle is inserted into the medication bottle. When the piston moves away from the protective needle 3, it combines... Figure 5 A negative pressure is generated inside the liquid receiving cavity 11. Because the edge of the flexible flow-blocking member 14's clearance hole is fixedly connected to the inner wall of the liquid receiving cavity 11, the outer edge of the flexible flow-blocking member 14 moves away from the outlet connector 12 under the action of the negative pressure, causing the flexible flow-blocking member 14 to deform. At this time, the two inlet channels 13 lose the obstruction from the flexible flow-blocking member 14, causing a negative pressure attraction to be generated in the inlet channel 32. The one-way valve 121 prevents the negative pressure attraction from being generated inside the injection needle 2. At this time, under the action of the negative pressure attraction, the external liquid flows sequentially through the inlet channel 32 and the inlet channel 13 into the liquid receiving cavity 11. Figure 6When the medication in the medication receiving chamber 11 is injected, the piston 42 moves closer to the protective needle 3. At this time, under the compression of the piston 42, a positive pressure is generated in the medication receiving chamber 11. Under the action of the positive pressure, the elastic flow-blocking element 14 adheres tightly to the inner wall of the medication receiving chamber 11, preventing the medication from flowing out of the inlet channel 32. At the same time, the one-way valve 121 opens under the action of the positive pressure, allowing the medication to be discharged from the injection needle 2 through the outlet connector 12. By repeating the above operation, the medication preparation operation can be completed. In the above configuration, the protective needle 3 and the injection needle 2 form independent inlet channels 13 and outlet channels, respectively. This not only ensures that the medication is drawn into the syringe 1, but also protects the injection needle 2 from wear. Furthermore, it prevents irritating drugs from contaminating the outer surface of the injection needle 2, thereby preventing irritating drugs from irritating the patient's skin.

[0036] Combination Figure 4-8 Specifically, the first needle seat and the liquid outlet connector 12 can be threaded together. In this configuration, the injection needle 2 and the syringe 1 can be connected with good strength. This allows the one-way valve 121 to resist the positive pressure from the liquid receiving chamber 11 when it is opened, so that the injection needle 2 will not separate from the syringe 1 when the patient is given an intramuscular injection. At the same time, it also avoids the risk of the injection needle 2 being pulled away when the protective needle 3 is separated from the syringe 1.

[0037] Specifically, the elastic flow barrier 14 is made of rubber or silicone material. The elastic flow barrier 14 made of this material has good flexibility and can quickly generate corresponding deformation as the piston moves, thereby ensuring the sealing effect on the liquid inlet channel 13.

[0038] Figure 9 A cross-sectional view used to illustrate the protective pin. Figure 10 This is a cross-sectional schematic diagram illustrating the protective needle. The inner surface of the receiving cavity 31 is provided with an elastic seal 311, wherein the elastic seal 311 is in a sealing connection with the outer surface of the injection needle 2, such as... Figure 8 , 9 As shown, the elastic seal 311 is annular. With this arrangement, after the protective needle 3 is fitted onto the injection needle 2, during liquid preparation, it prevents the medication from seeping between the outer surface of the injection needle 2 and the inner surface of the receiving cavity 31. This ensures that the negative pressure attraction is not dispersed and further prevents medication from adhering to the outer surface of the injection needle 2. Specifically, the elastic seal 311 can be a rubber ring made of silicone or rubber.

[0039] Figure 11 This is a schematic diagram illustrating the structure of the insertion protrusion. The liquid inlet channel 32 includes an inlet end 321 and a connecting end 322, as shown below. Figure 11As shown, the inlet end 321 is the end away from the second needle seat, and the connecting end 322 is the end that connects to the inlet channel 13 of the syringe 1. Referring to the figure, an insertion protrusion 323 is provided along the outline of the connecting end 322. After the protective needle 3 is connected to the syringe 1, the insertion protrusion 323 extends into the inlet channel 13. In this configuration, the inlet cavity 32 and the inlet channel 13 can be directly connected, thereby reducing the gap between the protective needle 3 and the syringe 1. Thus, when a negative pressure is generated in the drug container cavity 11, the negative pressure will not be dispersed.

[0040] This double-layer needle sterile syringe also includes a needle sheath, which is fitted over the protective needle 3. In actual use, after the medical personnel have prepared the solution, they can put the needle sheath over the outside of the protective needle 3, thereby isolating the protective needle 3 and the injection needle 2 from the outside world and preventing them from being contaminated. Specifically, the outer wall of the needle sheath is provided with a force-applying groove, which allows the medical personnel to easily apply force to the needle sheath, thus facilitating the fitting or removal of the needle sheath from the protective needle 3.

[0041] To keep the drawings concise, only the parts relevant to this application are shown schematically in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components with the same structure or function is shown schematically, or only one of them is labeled.

[0042] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0043] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of this application and are not intended to limit the scope of protection of this application. All equivalent implementations or modifications made without departing from the spirit of the art of this application, such as combinations, divisions or repetitions of features, should be included within the scope of protection of this application.

Claims

1. A sterile syringe with double-layered needles, characterized in that, It includes, The syringe has a liquid receiving cavity inside, and one end of it is provided with a liquid outlet connector and a liquid inlet channel. The liquid outlet connector is provided with a one-way valve. A piston rod that can be axially moved into the liquid receiving cavity; An elastic flow-blocking element is disposed within the liquid receiving cavity and covers the liquid inlet channel; The injection needle is connected to the liquid outlet connector; A protective needle has an internal receiving cavity and a liquid inlet cavity. The protective needle is fitted over the outside of the injection needle through the receiving cavity and connected to the syringe. The liquid inlet cavity communicates with the liquid inlet channel after being connected to the syringe. When the piston rod moves away from the protective needle, a negative pressure is generated in the liquid receiving cavity, causing the elastic flow-blocking element to deform and open, opening the liquid inlet channel. This creates a negative pressure attraction in the liquid inlet channel, and the one-way valve prevents the negative pressure attraction inside the injection needle. Under the action of the negative pressure attraction, the external liquid flows into the liquid receiving cavity sequentially through the liquid inlet channel and the liquid inlet passage. When the piston rod moves closer to the protective needle, a positive pressure is generated in the liquid receiving cavity. Under the action of the positive pressure, the elastic flow-blocking element adheres tightly to the inner wall of the liquid receiving cavity, preventing the liquid from flowing out of the liquid inlet channel. At the same time, the one-way valve opens under the action of the positive pressure, and the liquid in the liquid receiving cavity is discharged from the injection needle through the liquid outlet connector. In this way, the protective needle and the injection needle form independent liquid inlet and liquid outlet channels, which not only ensures that the liquid is drawn into the syringe, but also protects the injection needle from wear. The inner surface of the receiving cavity is provided with an elastic seal, wherein the elastic seal is sealed to the outer surface of the injection needle. After the protective needle is fitted onto the injection needle, during the liquid preparation operation, the elastic seal can prevent the liquid from seeping between the outer surface of the injection needle and the inner surface of the receiving cavity. Thus, while ensuring that the negative pressure attraction is not dispersed, it also further prevents the drug from adhering to the outer surface of the injection needle.

2. The sterile syringe with double-layered needles as described in claim 1, characterized in that, The elastic flow-blocking element is a circular sheet structure, wherein an avoidance hole is provided at the center of the elastic flow-blocking element, the avoidance hole corresponds to the liquid outlet connector, and the edge of the avoidance hole is fixedly connected to the inner wall of the liquid receiving cavity.

3. The sterile syringe with double-layered needles as described in claim 1, characterized in that, The injection needle is fixedly connected to the liquid outlet connector.

4. The sterile syringe with double-layered needles as described in claim 1, characterized in that, The protective needle is detachably connected to the syringe.

5. The sterile syringe with double-layered needles as described in claim 4, characterized in that, Along the length extension direction of the protective needle, one end of the protective needle is provided with a connecting part, wherein the connecting part is threaded to the syringe.

6. The sterile syringe with a double-layered needle as described in any one of claims 1-5, characterized in that, The inner wall of the receiving cavity is provided with several elastic seals, wherein several of the elastic seals are sealed to the outer surface of the injection needle.

7. The sterile syringe with double-layered needles as described in claim 1, characterized in that, The liquid inlet channel includes an inlet end and a connecting end, wherein a plug-in protrusion is provided along the contour of the connecting end, and after the protective needle is connected to the syringe, the plug-in protrusion extends into the liquid inlet channel.

8. The sterile syringe with double-layered needles as described in claim 1, characterized in that, Also includes: A needle sheath, which is fitted onto the protective needle.

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